Potassium promotion of iron oxide dehydrogenation catalysts supported on magnesium oxide: 2. 1-Butene dehydrogenation activity

Journal Article · Mon Jun 01 00:00:00 EDT 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90053-K· OSTI ID:6938948

Stobbe, D E; Buren, F.R. van ^[1]; Dillen, A.J. van.; Geus, J W ^[2]

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1. Dow Benelux, Terneuzen (Netherlands)
2. State Univ. of Utrecht (Netherlands)

Potassium promotion of iron oxide catalysts supported on magnesium oxide results in considerably more active and selective 1-butene dehydrogenation catalysts. Upon promotion the activation energy was found to decrease from 194 to 156 kJ/mol. KFeO[sub 2] appeared to be the active phase under dehydrogenation conditions. No reduction of KFeO[sub 2] was observed. KFeO[sub 2] shows high 1-butene dehydrogenation activity, yet is not sufficiently effective to suppress coking entirely. For that purpose the presence of highly dispersed potassium carbonate at the catalyst surface is a prerequisite. Under identical dehydrogenation conditions, a commercial unsupported catalyst, S-105, which contains the more easily reducible KF[sub 11]O[sub 13], is reduced to Fe[sub 3]O[sub 4]. Compared with this unsupported S-105 catalyst, the supported catalysts show significantly higher 1,3-butadiene selectivities at comparable conversion levels, which is to be attributed to the different natures of their respective active phases.

• OSTI ID: 6938948
• Journal Information: Journal of Catalysis; (United States), Vol. 135:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
BUTENES
DEHYDROGENATION
IRON OXIDES
CATALYTIC EFFECTS
POTASSIUM COMPOUNDS
ACTIVATION ENERGY
BUTADIENE
CATALYST SUPPORTS
CATALYSTS
COKE
DEPOSITION
MAGNESIUM OXIDES
POTASSIUM CARBONATES
PROMOTERS
SYNTHESIS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALKENES
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
DIENES
ENERGY
HYDROCARBONS
IRON COMPOUNDS
MAGNESIUM COMPOUNDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLYENES
TRANSITION ELEMENT COMPOUNDS
020400* - Petroleum- Processing